feat: compute static costs

execution/engine/execution_engine.go

@@ -68,6 +68,8 @@
 	resolver                 *resolve.Resolver
 	executionPlanCache       *lru.Cache
 	apolloCompatibilityFlags apollocompatibility.Flags
+	// Holds the plan after Execute(). Used in testing.
+	lastPlan                 plan.Plan
 }
 
 type WebsocketBeforeStartHook interface {
@@ -214,6 +216,7 @@
 	if report.HasErrors() {
 		return report
 	}
+	e.lastPlan = cachedPlan
 
 	if execContext.resolveContext.TracingOptions.Enable && !execContext.resolveContext.TracingOptions.ExcludePlannerStats {
 		planningTime := resolve.GetDurationNanoSinceTraceStart(execContext.resolveContext.Context()) - tracePlanStart